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Image-based inertial impact (IBII) tests for measuring the interlaminar shear moduli of composites

Image-based inertial impact (IBII) tests for measuring the interlaminar shear moduli of composites
Image-based inertial impact (IBII) tests for measuring the interlaminar shear moduli of composites
The image-based inertial impact (IBII) test has previously shown that inertial effects generated with high-strain-rate loading can be used to measure the dynamic constitutive properties of composites at strain rates on the order of 1,600 s−1 . This work represents an important next step in exploring the potential of this concept with two tests presented where loading heterogeneity is exploited to measure the interlaminar shear modulus and stress-strain behaviour at high strain rates. The first test configuration used a short-beam with asymmetric loading to activate the shear behaviour. The virtual fields method (VFM) was used to directly identify the interlaminar shear modulus from heterogeneous full-field maps of strain and acceleration. Simulated experiments were used to optimise the test configuration, select optimal smoothing parameters, and quantify uncertainty from grid rotation on the shear modulus identifications. The test was validated experimentally with three different virtual fields identifying an average shear modulus ranging from 5.7 GPa to 5.9 GPa measured at 1,600 s−1, representing a 16-19% increase compared to quasi-static measurements. The shear modulus could also be identified from shear introduced into specimens tested in the standard, end-on interlaminar IBII configuration from slight in-plane misalignments of the impactor. The identified value of 5.6 GPa validates measurements from the first configuration and also demonstrates the capability to identify multiple interlaminar stiffness parameters from a single test.
2199-7446
373–398
Van Blitterswyk, Jared
d113eca6-6ee0-4f0e-a983-b5636fadbd71
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Van Blitterswyk, Jared
d113eca6-6ee0-4f0e-a983-b5636fadbd71
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Van Blitterswyk, Jared, Fletcher, Lloyd and Pierron, Fabrice (2020) Image-based inertial impact (IBII) tests for measuring the interlaminar shear moduli of composites. Journal of Dynamic Behavior of Materials, 6, 373–398.

Record type: Article

Abstract

The image-based inertial impact (IBII) test has previously shown that inertial effects generated with high-strain-rate loading can be used to measure the dynamic constitutive properties of composites at strain rates on the order of 1,600 s−1 . This work represents an important next step in exploring the potential of this concept with two tests presented where loading heterogeneity is exploited to measure the interlaminar shear modulus and stress-strain behaviour at high strain rates. The first test configuration used a short-beam with asymmetric loading to activate the shear behaviour. The virtual fields method (VFM) was used to directly identify the interlaminar shear modulus from heterogeneous full-field maps of strain and acceleration. Simulated experiments were used to optimise the test configuration, select optimal smoothing parameters, and quantify uncertainty from grid rotation on the shear modulus identifications. The test was validated experimentally with three different virtual fields identifying an average shear modulus ranging from 5.7 GPa to 5.9 GPa measured at 1,600 s−1, representing a 16-19% increase compared to quasi-static measurements. The shear modulus could also be identified from shear introduced into specimens tested in the standard, end-on interlaminar IBII configuration from slight in-plane misalignments of the impactor. The identified value of 5.6 GPa validates measurements from the first configuration and also demonstrates the capability to identify multiple interlaminar stiffness parameters from a single test.

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vanblitterswyk jdbm accepted manuscript ibii shear moduli composites - Accepted Manuscript
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Accepted/In Press date: 6 July 2020
Published date: 5 August 2020

Identifiers

Local EPrints ID: 442800
URI: http://eprints.soton.ac.uk/id/eprint/442800
ISSN: 2199-7446
PURE UUID: b182f2c8-b750-4ea5-bdab-e756e3122d70
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

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Date deposited: 27 Jul 2020 16:31
Last modified: 05 Jul 2021 04:01

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